![]() ![]() You can get a good idea of what WindowServer does using screenshots. distnoted is a system message notification service, and MTLCompilerService manages accelerated graphics commands in Metal. They’re part of a group of interconnected services which handle window management, the compositing of windows into the display image, and event-routing for apps. You may also notice that it’s one of a small group of processes including distnoted and MTLCompilerService which have their own user, _windowserver. Open Activity Monitor, and you’ll see WindowServer close to the top of the lists of CPU, Memory and Energy users, and when it’s getting into trouble that’s always a good place to check what’s up with it. Without WindowServer there can be no GUI. From the moment the login window appears during startup, WindowServer is hard at work, and remains so until you shut your Mac down. To assemble all those into what you see on the display, it takes the master compositor, WindowServer. In macOS, apps including the Finder manage the contents of their own windows.
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